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Bi-Interlayer Strategy for Modulating NiCoP-Based Heterostructure toward High-Performance Aqueous Energy Storage
Jian Xu1, Xiliang Gong1,2, Zeshuo Meng1
1Key Laboratory of Automobile Materials MOE, School of Materials & Engineering, Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun, 130012, China.
Novel nickel-cobalt phosphide (NiCoP) heterostructures integrated with bismuth interlayers demonstrate enhanced electrochemical performance. These advanced materials show significant potential for high-performance aqueous energy storage devices, including supercapacitors and zinc-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Nickel-cobalt phosphides (NiCoP) are promising electrode materials for aqueous energy storage due to their high electrochemical activity.
- Improving the specific capacitance and rate capability of NiCoP materials is crucial for practical applications.
- Heterostructural design and controlled loading on substrates are key strategies for material enhancement.
Purpose of the Study:
- To design and fabricate novel hierarchical bismuth-nickel-cobalt phosphide (Bi-NCP) heterogeneous structures.
- To enhance charge and ion transport through built-in electric fields and uniform material loading.
- To evaluate the electrochemical performance of the fabricated electrodes in aqueous energy storage devices.
Main Methods:
- Fabrication of hierarchical Bi-NCP heterogeneous structures via electrodeposition of bismuth interlayers on carbon cloth.
- Characterization of material morphology, composition, and electrochemical properties.
- Assembly and testing of hybrid supercapacitors, supercapatteries, and alkaline zinc-ion batteries using the developed electrodes.
Main Results:
- Uniform, continuous, and high mass loading (>3.5 mg) of Bi-NCP on carbon cloth substrates achieved.
- Superior specific capacitance of 1200 F g-1 at 1 A g-1 and 4129 mF cm-2 at 1 mA cm-2.
- High-rate capability, durable cyclic stability, and high energy densities (64.4–319.1 Wh kg-1) in assembled devices.
Conclusions:
- The developed Bi-NCP heterostructures exhibit excellent electrochemical performance for aqueous energy storage.
- The hierarchical design and built-in electric fields effectively promote charge and ion transport.
- These novel heterostructure electrodes hold significant potential for advanced energy storage applications.
